Missing flags with cross-staff beams

[Michael Rivers]

In this code from a transcription of Meditation from the opera Thais by
Massenet, I'm not getting flags on the 8th notes, and I had to add manual
beams to the double-dotted 8th note and 32nd note. The example in the
manual works fine, but I can't find the difference between it and my code.

\version "2.25.25"

global = {
  \key d \major
  \time 4/4
}

right = \relative c' {
  \global
  << { \voiceOne
       \crossStaff { f8..([ e32)] e4~ e8 <bes des f>4-> q8-> } |
     }
     \new Voice {
       \voiceTwo
       r8 <bes des>4. s2 |
     }
  >>

}

left = \relative c {
  \global
  << { \voiceOne
       \crossStaff { f8..( e32) e4~ e8 f4 f8 } |
     }
     \new Voice {
       \voiceTwo
       g,,8 g' bes des f,, f' bes des |
     }
  >>

}

\score {
  \new PianoStaff <<
    \new Staff = "right" \right
    \new Staff = "left" { \clef bass \left }
  >>
  \layout {
    \context {
    \PianoStaff
    \consists "Span_stem_engraver"
  }
  }
}